In terms of how label information communicates hazard, what does the signal word primarily convey?

• A. The product's environmental hazards
• B. The relative acute toxicity to humans and animals
• C. PPE requirements
• D. Mechanism of action

Answer: (B)

The signal word on a hazard label communicates the relative severity of the hazard, especially the acute toxicity to humans and animals. It uses terms like Danger for more severe hazards and Warning for less severe ones, giving a quick sense of how urgent the risk is and what level of protection might be needed. This word itself doesn’t describe environmental hazards, PPE requirements, or the chemical’s mechanism of action; those details come from other parts of the label. So the main function of the signal word is to indicate how severe the acute toxicity risk is for people and animals.